//package com.itheima.reggie.filter;
//
//
//import com.fasterxml.jackson.databind.ObjectMapper;
//import com.itheima.reggie.common.BaseContext;
//import com.itheima.reggie.common.R;
//import lombok.extern.slf4j.Slf4j;
//import org.springframework.util.AntPathMatcher;
//
//import javax.servlet.*;
//import javax.servlet.annotation.WebFilter;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
//import java.io.IOException;
//import java.util.Scanner;
//
//@WebFilter("/*") //所有路径都要经过过滤器
//@Slf4j
//public class LoginCheckFilter implements Filter {
//    //路径匹配器，支持通配符
//    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
//
//    @Override
//    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//        //添加Http
//        HttpServletRequest request = (HttpServletRequest) servletRequest;
//        HttpServletResponse response = (HttpServletResponse) servletResponse;
//        // 1 获取本次请求URI
//        String requestURI = request.getRequestURI();
////        System.out.println("============获取请求路径===============");
////        System.out.println("requestURI" + requestURI);
////        System.out.println("============获取请求路径===============");
//
//        //定义不需要处理的请求路径
//        String[] urls = new String[]{
//                "/employee/login",
//                "/employee/logout",
//                "/common/**",
//                "/backend/**",
//                "/front/**",
//                "/user/login",
////                "/shoppingCart/list",
//                "/addressBook/list"
//        };
//
//        // 2 判断本次请求是否需要处理
//        boolean check = check(urls, requestURI);
//        // 3 URI在范围内就放行
//        if (check) {
//            filterChain.doFilter(request, response);
//            return;
//        }
//
//        // 4 已登录的直接放行
////        Object employee = request.getSession().getAttribute("employee");
//      /*  if (employee != null) {
//            Long empId = (Long) request.getSession().getAttribute("employee");
//            BaseContext.setCurrentId(empId);
//            filterChain.doFilter(request, response);
//            return;
//
//        }*/
//        if (request.getSession().getAttribute("employee") != null) {
//            Long employee = (Long) request.getSession().getAttribute("employee");
//            BaseContext.setCurrentId(employee);
//            filterChain.doFilter(request, response);
//            return;
//        }
//
////        Long userID = (Long) request.getSession().getAttribute("user");
////        if(userID != null) {
////            //向本地线程变量中存放当前用户的id
////            BaseContext.setCurrentId(userID);
////            //System.out.println("LoginCheckFilter:我已经是登录状态了，直接放行！");
////            filterChain.doFilter(request,response);
////            return;
////        }
//
//
//        if (request.getSession().getAttribute("user") != null) {
//            Long userID = (Long) request.getSession().getAttribute("user");
//            BaseContext.setCurrentId(userID);
//            filterChain.doFilter(request, response);
//            return;
//        }
//
//        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
//        //将R对象转为JSON作为未登录的结果
//        response.getWriter().write(new ObjectMapper().writeValueAsString(R.error("NOTLOGIN")));
//        return;
//
//    }
//
//
//    public boolean check(String[] urls, String requestURI) {
//        for (String url : urls) {
//            boolean match = PATH_MATCHER.match(url, requestURI);
//            if (match) {
//                return true;
//            }
//        }
//        return false;
//    }
//
//}
package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @program: reggie_take_out
 * @description:检查用户是否已经完成登录
 * @create: 2022-11-17 10:22
 **/
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截请求:{}", requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg"
//                "/addressBook/list"
        };

        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3、如果不需要处理，则直接放行
        if (check) {
//            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        //4、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }
        //4-2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");

        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配,检查是否需要放行
     *
     * @param urls
     * @param requestURI
     * @return
     */
    private boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
